You don't need to test with dechlorinator added.
I recommend that you get your own liquid reagent test kits, or at the very least liquid testers for ammonia and nitrite. If the fish start to behave unusually you need to test for those two immediately, and the shops may not be open when you need to test.
I recommend that you get your own liquid reagent test kits, or at the very least liquid testers for ammonia and nitrite. If the fish start to behave unusually you need to test for those two immediately, and the shops may not be open when you need to test.